With a low temp thermostat in place your engine coolant is allowed to
circulate around the engine much earlier which allows overall engine
temperatures to be reduced sooner than they would normally occur.
Ultimately your coolants job is to carry heat out of the engine, take it
through your radiator (where the actual temperature reduction will
occur) and then flow back into the engine at a reduced temperature to
when it left. This entire process is activated by a door opening and
closing (your thermostat), so if this "door" is opened earlier than
would normally be expected then the coolant can get a head start on
taking heat out of the engine.

With coolant flowing through your engine at an earlier stage (thanks
to a low temp thermostat) the next area to make significant temperature
drops would be a performance radiator. A larger radiator not only
increases how much coolant can be present within it at any one time, but
with a larger surface area and an improved fin design this can allow a
higher volume of air to pass through, this in turn lowers temperatures
on your coolant fluid faster, more efficiently and in greater volume.

Low temperature thermostats are most suited for vehicles driven
"spiritdley" on either road or track where engine temperatures are
likely to raise at a much faster rate than if the engine was being
driven under normal road use.